Checking The Valve Springs; Checking The Valves - Yamaha FT50C Service Manual

POWR
5. Remove the retaining bolt 4, then the
camshaft 5 by pulling it downward.
6. Remove the intake valve and exhaust
valves.
NOTE:
• Be sure to keep the valves and other parts
in the order that they were removed.
5-25
Power unit
• When replacing the valve, also replace the
valve guide and stem seal.
Valve spring compressor 6:
90890-04019
Valve spring compressor attachment
7:
90890-06320

Checking the valve springs

1. Measure the valve spring free length a.
Replace if out of specification.
Valve spring free length limit a:
37.85 mm (1.490 in)
2. Measure the valve spring tilt b. Replace
if out of specification.
Valve spring tilt limit b:
1.7 mm (0.07 in)

Checking the valves

1. Check the valve face for pitting or wear.
Replace if necessary.
2. Measure the valve margin thickness a.
Replace if out of specification.
62Y5A11